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"'x,y,z'", "'y,x,2/3-z'", "'-y,x-y,2/3+z'", "'-x,-x+y,1/3-z'", "'-x+y,-x,1/3+z'", "'x-y,-y,-z'", "loop_", "_atom_site_label", "_atom_site_fract_x", "_atom_site_fract_y", "_atom_site_fract_z", "Si 0.48550 0.00000 0.00000", "O 0.41740 0.23970 0.14220", "loop_", "_atom_site_aniso_label", "_atom_site_aniso_U_11", "_atom_site_aniso_U_22", "_atom_site_aniso_U_33", "_atom_site_aniso_U_12", "_atom_site_aniso_U_13", "_atom_site_aniso_U_23", "Si 0.02237 0.01812 0.01851 0.00906 -0.00018 -0.00036", "O 0.04861 0.04540 0.04544 0.02945 -0.00572 -0.02169", "data_global", "_chemical_name_mineral 'Quartz'", "loop_", "_publ_author_name", "'Kihara K'", "_journal_name_full 'European Journal of Mineralogy'", "_journal_volume 2", "_journal_year 1990", "_journal_page_first 63", "_journal_page_last 77", "_publ_section_title", ";", "An X-ray study of the temperature dependence of the quartz structure", "Sample: at T = 848 K", ";", "_database_code_amcsd 0006370", "_chemical_formula_sum 'Si O2'", "_cell_length_a 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0.41570 0.20785 0.16667", "loop_", "_atom_site_aniso_label", "_atom_site_aniso_U_11", "_atom_site_aniso_U_22", "_atom_site_aniso_U_33", "_atom_site_aniso_U_12", "_atom_site_aniso_U_13", "_atom_site_aniso_U_23", "Si 0.02637 0.02030 0.01977 0.01015 0.00000 0.00000", "O 0.05056 0.05474 0.05779 0.02528 0.00000 -0.03123", "data_global", "_chemical_name_mineral 'Quartz'", "loop_", "_publ_author_name", "'Kihara K'", "_journal_name_full 'European Journal of Mineralogy'", "_journal_volume 2", "_journal_year 1990", "_journal_page_first 63", "_journal_page_last 77", "_publ_section_title", ";", "An X-ray study of the temperature dependence of the quartz structure", "Sample: at T = 859 K", ";", "_database_code_amcsd 0006372", "_chemical_formula_sum 'Si O2'", "_cell_length_a 4.9973", "_cell_length_b 4.9973", "_cell_length_c 5.4572", "_cell_angle_alpha 90", "_cell_angle_beta 90", "_cell_angle_gamma 120", "_cell_volume 118.024", "_exptl_crystal_density_diffrn 2.536", "_symmetry_space_group_name_H-M 'P 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0.01992 0.01034 0.00000 0.00000", "O 0.05095 0.05474 0.05839 0.02547 0.00000 -0.03147", "data_global", "_chemical_name_mineral 'Quartz'", "loop_", "_publ_author_name", "'Kihara K'", "_journal_name_full 'European Journal of Mineralogy'", "_journal_volume 2", "_journal_year 1990", "_journal_page_first 63", "_journal_page_last 77", "_publ_section_title", ";", "An X-ray study of the temperature dependence of the quartz structure", "Sample: at T = 891 K", ";", "_database_code_amcsd 0006374", "_chemical_formula_sum 'Si O2'", "_cell_length_a 4.9972", "_cell_length_b 4.9972", "_cell_length_c 5.4569", "_cell_angle_alpha 90", "_cell_angle_beta 90", "_cell_angle_gamma 120", "_cell_volume 118.013", "_exptl_crystal_density_diffrn 2.536", "_symmetry_space_group_name_H-M 'P 62 2 2'", "loop_", "_space_group_symop_operation_xyz", "'x,y,z'", "'x,x-y,1/3-z'", "'x-y,x,1/3+z'", "'y,x,2/3-z'", "'-y,x-y,2/3+z'", "'-x+y,y,-z'", "'-x,-y,z'", "'-x,-x+y,1/3-z'", "'-x+y,-x,1/3+z'", "'-y,-x,2/3-z'", 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"High-pressure crystal chemistry and amorphization of alpha-quartz", "Sample: P = 1 bar", ";", "_database_code_amcsd 0015462", "_chemical_compound_source 'Synthetic'", "_chemical_formula_sum 'Si O2'", "_cell_length_a 4.914", "_cell_length_b 4.914", "_cell_length_c 5.406", "_cell_angle_alpha 90", "_cell_angle_beta 90", "_cell_angle_gamma 120", "_cell_volume 113.052", "_exptl_crystal_density_diffrn 2.648", "_symmetry_space_group_name_H-M 'P 31 2 1'", "loop_", "_space_group_symop_operation_xyz", "'x,y,z'", "'y,x,-z'", "'-y,x-y,1/3+z'", "'-x,-x+y,1/3-z'", "'-x+y,-x,2/3+z'", "'x-y,-y,2/3-z'", "loop_", "_atom_site_label", "_atom_site_fract_x", "_atom_site_fract_y", "_atom_site_fract_z", "_atom_site_U_iso_or_equiv", "Si1 0.46990 0.00000 0.33333 0.00646", "O1 0.41300 0.26680 0.21400 0.01089", "data_global", "_chemical_name_mineral 'Quartz'", "loop_", "_publ_author_name", "'Hazen R M'", "'Finger L W'", "'Hemley R J'", "'Mao H K'", "_journal_name_full 'Solid State Communications'", "_journal_volume 72", "_journal_year 1989", "_journal_page_first 507", "_journal_page_last 511", "_publ_section_title", ";", "High-pressure crystal chemistry and amorphization of alpha-quartz", "Sample: P = 2.0 Gpa", ";", "_database_code_amcsd 0015463", "_chemical_compound_source 'Synthetic'", "_chemical_formula_sum 'Si O2'", "_cell_length_a 4.812", "_cell_length_b 4.812", "_cell_length_c 5.327", "_cell_angle_alpha 90", "_cell_angle_beta 90", "_cell_angle_gamma 120", "_cell_volume 106.823", "_exptl_crystal_density_diffrn 2.802", "_symmetry_space_group_name_H-M 'P 31 2 1'", "loop_", "_space_group_symop_operation_xyz", "'x,y,z'", "'y,x,-z'", "'-y,x-y,1/3+z'", "'-x,-x+y,1/3-z'", "'-x+y,-x,2/3+z'", "'x-y,-y,2/3-z'", "loop_", "_atom_site_label", "_atom_site_fract_x", "_atom_site_fract_y", "_atom_site_fract_z", "_atom_site_U_iso_or_equiv", "Si 0.46460 0.00000 0.33333 0.00646", "O 0.40930 0.27780 0.22640 0.01089", "data_global", "_chemical_name_mineral 'Quartz'", "loop_", "_publ_author_name", 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